JP3241903B2 - Signal processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing device for displaying signals from two signal sources on two display devices.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal display (hereinafter referred to as an LCD)
In the case of displaying video information as described above, for example, in LCD, a method of inverting the polarity of the video signal and the voltage of the common electrode at regular intervals is used to prevent pixel burn-in due to the DC component of the video signal. Used. Also, a head-mounted display that uses two LCDs to display video information for the right eye and the left eye on each LCD has been proposed. However, when two LCDs are used, it is necessary to invert the video signal in each signal path at regular intervals, and a method of switching by providing signal processing means for inversion or non-inversion in each signal path, A method is used in which signal processing means capable of switching between inverting and non-inverting polarities is provided in a signal path, and the polarity of the video signal is switched by switching the polarity of the signal processing means.

[0003]

However, in the prior art as described above, for example, in a method in which signal processing means for inversion and non-inversion are provided, the number of signal processing means becomes too large. In the method of providing signal processing means capable of switching between inversion and non-inversion and switching the polarity thereof, it is necessary to adjust the amount of delay between inversion and non-inversion in each signal processing means.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art in a signal processing apparatus, and can reduce the number of signal processing means and adjust the delay time during inversion / non-inversion. The purpose is to provide means that can reduce the cost.

[0005]

Therefore, in the present invention, a signal processing apparatus of this kind includes first and second signal sources for generating first and second video signals, respectively, Inverting means for inverting one of the first and second video signals, first selecting means for selectively supplying one of the first and second video signals to the inverting means, First and second display means for respectively converting the first and second video signals into optical signals; and selectively outputting the video signal inverted by the inverting means and the other non-inverted video signal to the optical signal. And second selection means for supplying each of the first and second video signals to the inverting means by the first selection means. The polarity is inverted by the inverting means, and the polarity inverted video signal and the inverted And a non-inverted video signal which does not pass through the means is selectively supplied to the first and second display means by the second selecting means, and after a lapse of a predetermined time, the video signal inputted to the inverting means is switched. Thus, the object is achieved by configuring the inverting means to be shared by two video signal paths.

[0006]

According to the structure of the present invention as described above, the respective signal paths between the first and second signal processing means for generating the first and second video signals and the first and second display means. Inverting means for inverting a video signal into the first and second video signals
A first selection unit for selectively supplying a video signal from the signal source to the inversion unit, and a first selection unit for selectively supplying a video signal from the inversion unit to the first and second display units. By providing the second selecting means, the video signal supplied to the inverting means is switched to the first and second video signals at predetermined time intervals, and the video signal from the inverting means is switched to the first video signal. When inverted, the second display is displayed on the first display means.
In the case of the video signal, the second selecting means for selectively supplying the signal to the second display means reduces the number of inverting means by sharing one inverting means in two signal paths. The apparatus can be simplified by reducing the number of adjustments of the delay time at the time of inversion.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on a plurality of embodiments. (Embodiment 1) FIG. 1 shows a first embodiment of a signal processing apparatus according to the present invention.
1 shows a configuration block diagram of an embodiment. In FIG. 1, 1 is
A first signal source for outputting a first video signal, 2
A second signal source 3 for outputting a second video signal;
First display means 4 for displaying the video signal of the first signal source 1 is second display means for displaying the video signal of the second signal source 2, and 5 is the first display. A first driver 6 for supplying a video signal to the means 3; a second driver 7 for supplying a video signal to the second display means 4;
Is an inverting means for inverting the video signal from the first or second signal source 1 or 2, and 8 is an inverting means 7 for selectively inverting the video signal from the first or second signal source 1 or 2. A first selection means for inputting the video signal inverted by the inversion means 7 to the first driver 5 and the second driver 6 selectively; 10
Is a control unit (control unit) for counting the horizontal scanning signals of the signal sources 1 and 2 and controlling the operations of the first selection unit 8 and the second selection unit 9.

Next, the operation of the first embodiment will be described.
First, first and second video signals are output from the first and second signal sources 1 and 2, respectively. Next, the control unit 10 counts the horizontal scanning signals of the respective video signals input from the signal sources 1 and 2, and when it is determined that the row is an odd-numbered row, the first selection unit 8 sets each contact b , D, and the first video signal is input to the inverting means 7. At this time, the second video signal is not input to the inverting means 7 but is input directly to the second selecting means 9. And the reversing means 7
The polarity of the first video signal input to is output to the second selection unit 9 after its polarity is inverted. Next, the second selection means is connected to the respective contacts f and h, and the inverted first video signal is input to the first driver 5 and the second video signal is input to the second driver 6 respectively. , And first and second display means, respectively.

When the control section 10 counts the horizontal scanning signal and determines that the row is an even-numbered row, the first selecting means 8 is connected to each of the contact points a and c to transmit the second video signal. The first video signal is input to the inverting means 7 and is directly input to the second selecting means 9 without being input to the inverting means 7. Then, the polarity of the second video signal input to the inverting means 7 is inverted and output to the second selecting means 9. Next, the second selection means 9 is connected to each of the contacts e and g, the first video signal is input to the first driver 5, and the inverted second video signal is supplied to the second driver 6. ,
It is supplied to the first and second display means 3 and 4, respectively. However, when the first and second signal sources 1 and 2 are not synchronized when the horizontal scanning signal is counted by the control unit 10, the first and second signal sources are fed back to synchronize. Take.

As described above, by switching the signal input to the inverting means 7 for each row, one inverting means 7 can be shared by two signal paths.

The switching of the video signal input to the inverting means 7 may be performed not only for each row, but also for a plurality of rows, random for each row, random for each pixel, random for each pixel, or the like. In either method, the number of inverted rows (the number of pixels) is counted in the control unit 10, and the number of inverted rows (the number of pixels) and the number of non-inverted rows (the number of pixels) in units of a screen are counted.
May be the same. Similarly, when inverting for each pixel, the number of pixels inverted for each row may be the same as the number of pixels that are not inverted, or the screen may be divided into a plurality of blocks, and the number of inverted pixels may be set for each block. And the number of non-inverted pixels may be the same.

(Embodiment 2) FIG. 2 is a block diagram showing the configuration of a second embodiment of the signal processing apparatus according to the present invention. In FIG. 2, reference numerals 1 to 7 and 10 denote the same (corresponding) components as those in the first embodiment, and a duplicate description thereof will be omitted. In the second embodiment, the first and second selecting means 8 and 9 in the first embodiment are connected between the contacts a and e and between d and h.
The first and second delay units 11 and 12 for video signals having the same delay time as the inversion unit 7 are provided.
8 is a first selection means for selectively inputting the video signal from the first or second signal source 1 or 2 to the inversion means 7 and each of the delay means 11 and 12; Second selection means for selectively supplying the inverted video signal and the video signal delayed by each of the delay means 11 and 12 to the first driver and the second drivers 5 and 6.

Next, the operation will be described. First, first and second video signals are output from the first and second signal sources 1 and 2, respectively. Next, when the control unit 10 counts the horizontal scanning signals of the respective video signals input from the signal sources 1 and 2 and determines that it is an odd-numbered row, the first
Is connected to the contacts b and d, and the first video signal is input to the inverting means 7. At this time, the second video signal is input to the delay means 12 without being input to the inverting means 7. Is done. Then, the polarity of the first video signal input to the inversion means 7 is inverted and output to the second selection means 9, and the second video signal input to the delay means 12 is the same as that of the inversion means 7. The output is delayed by the time and output to the second selecting means 9. Next, the second selection means 9 is connected to the respective contacts f and h, and the inverted first video signal is supplied to the first driver 5.
The second video signal is input to the second driver 6 and supplied to the first and second display means 3 and 4, respectively.

When the control section 10 counts the horizontal scanning signal and determines that the row is an even-numbered row, the first selecting means 8 is connected to each of the contacts a and c, and the second video signal is inverted by the inverting means 7. At this time, the first video signal is input to the delay means 11 without being input to the inversion means 7. And
The polarity of the second video signal input to the inverting means 7 is inverted and output to the second selecting means 9 and the delay means 1
The first video signal input to 1 is delayed by the same time as the inverting means 7 and output to the second selecting means 9. Next, the second selection means 9 is connected to the respective contacts e and g, and
Are input to a first driver 5 and the inverted second video signal is input to a second driver 6, respectively.
The signals are supplied to the second display means 3 and 4, respectively. However,
If the first and second signal sources 1 and 2 are not synchronized when the control section 10 counts the horizontal scanning signals, the first and second signal sources 1 and 2 are fed back and synchronized. Take.

As described above, by switching the signal input to the inverting means 7 for each row, it is possible to supply one inverting means 7 through two signal paths.

The switching of the video signal input to the inverting means 7 may be performed not only for each row, but also for a plurality of rows, random for each row, random for each pixel, random for each pixel, or the like. In either method, the number of inverted rows (the number of pixels) is counted in the control unit 10, and the number of inverted rows (the number of pixels) and the number of non-inverted rows (the number of pixels) in units of a screen are counted.
May be the same. In the case of inversion for each pixel, the number of pixels inverted for each row may be the same as the number of pixels that are not inverted, or the screen may be divided into a plurality of blocks, and the number of inverted pixels may be set for each block. The ratio of the number of non-inverted pixels may be the same.

(Embodiment 3) FIG. 3 is a block diagram showing the configuration of a third embodiment of the signal processing apparatus according to the present invention.
In FIG. 3, reference numerals 1 to 7 denote the same (corresponding) components as those in the first and second embodiments, and a duplicate description of each is omitted. 8A is a first selection means for selectively inputting the video signal from the first or second signal source 1 or 2 to the inversion means 7 and the delay means 11, and 9A is inverted by the inversion means 7. Second selection means for selectively supplying the video signal and the video signal delayed by the delay means to the first driver and the second drivers and 6;
A is a control unit (control unit) for counting the horizontal scanning signals of the signal sources 1 and 2 and controlling the operations of the first selection unit 8A and the second selection unit 9A. This is a delay means having a delay time.

Next, the operation will be described. First, first and second video signals are output from the first and second signal sources 1 and 2, respectively. Next, when the control unit 10A counts the horizontal scanning signal of each of the video signals input from the signal sources 1 and 2 and determines that it is an odd-numbered row,
The first selection means 8A is connected to each of the contact points b and d, the first video signal is supplied to the inversion means 7, and the second video signal is supplied to the delay means 11
Is input to Then, the polarity of the first video signal input to the inversion means 7 is inverted and the second video signal is input to the second selection means 9A.
And the second video signal input to the delay means 11 is delayed by the same time as the inversion means 7 and output to the second selection means 9A. Next, the second selecting means 9A is connected to each of the contact points f and h, and the inverted first video signal is supplied to the first driver 5, and the delayed second video signal is supplied to the second driver 6. And are supplied to the first and second display means 3 and 4, respectively, to be displayed.

When the control section 10A counts the horizontal scanning signal and determines that the row is an even-numbered row, it connects the first selecting means 8A to each of the contacts a and c, and inverts the second video signal. 7, the first video signal is input to the delay unit 11. Then, similarly to the odd-numbered row, the polarity of the second video signal input to the inversion means 7 is inverted and output to the second selection means 9A, and the first video signal input to the delay means 11 Is output to the second selecting means 9A after being delayed by the same time as the inverting means 7. Next, the second selecting means 9A is connected to each of the contacts i and j, and the delayed first
Are input to a first driver 5 and the inverted second video signal is input to a second driver 6, respectively.
The signals are supplied to the second display means 3 and 4, respectively. However,
If the first and second signal sources 1 and 2 are not synchronized when counting the horizontal scanning signal in the control unit 10A, feedback is applied to the first and second signal sources 1 and 2. Synchronize.

As described above, by switching the input destinations of the first and second video signals to the inverting means 7 and the delaying means 11 for each row, one inverting means 7 and the delaying means 11 can be connected to two signal paths. It is possible to share in.

The switching of the video signal input to the inverting means 7 may be performed not only for each row, but also for a plurality of rows, random for each row, random for each pixel, random for each pixel, or the like. In either method, the number of inverted rows (the number of pixels) is counted in the control unit 10A, and the ratio of the number of inverted rows (the number of pixels) and the number of non-inverted rows (the number of pixels) for each screen is made equal. Is also good. Similarly, when inverting for each pixel, the number of pixels inverted for each row may be the same as the number of pixels that are not inverted, or the screen may be divided into a plurality of blocks, and the number of inverted pixels may be set for each block. And the ratio of the number of non-inverted pixels may be the same.

[0022]

As described above, according to the present invention,
By switching the signal input to the inversion means for each row,
One inverting means can be shared by two signal paths, and one inverting means and delay means can be switched by switching the input destination of the first and second video signals to the inverting means and delay means for each row. Can be shared by the two signal paths, and the number of signal processing means or the number of delays at the time of inversion / non-inversion can be reduced to simplify the device.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a first embodiment.

FIG. 2 is a configuration block diagram of a second embodiment.

FIG. 3 is a configuration block diagram of a third embodiment.

[Explanation of symbols]

 1,2 signal source 3,4 display means 5,6 driver 7 inversion means 8,8A, 9,9A selection means 10,10A control unit (control means) 11,12 delay means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G09G 3/00-3/38 G02F 1/133 505-580 H04N 13/04

Claims (10)

(57) [Claims] A first signal source for generating first and second video signals, an inverting means for inverting one of the first and second video signals, First
First selecting means for selectively supplying one of the second video signals to the inverting means, and first and second means for converting the first and second video signals into optical signals, respectively. Display means, and second selection means for selectively supplying the video signal inverted by the inversion means and the other non-inversion video signal to the first and second display means, respectively.
One of the first and second video signals is selectively input to the inverting means by the first selecting means, and the polarity is inverted by the inverting means. Non-inverted video signal is selectively supplied to the first and second display means by the second selection means,
A signal processing apparatus characterized in that the video signal input to the inversion means is switched after a predetermined time has elapsed, so that the inversion means is shared by two video signal paths. 2. A delay unit having the same delay time as the inversion unit is added, and one of the first and second video signals is input to the inversion unit by the first selection unit, and the other is input to the inversion unit. 2. A signal processing means according to claim 1, wherein said inverting means is shared by selectively inputting to said delay means, and a time lag caused by passing through said inverting means is eliminated. 3. The signal processing apparatus according to claim 1, wherein a cycle of switching the video signal input to the inverting means by the first selecting means is set for each row. 4. A signal according to claim 1, wherein a cycle of switching the video signal input to said inverting means by said first selecting means is set to every two or more rows. Processing equipment. 5. The signal processing apparatus according to claim 1, wherein a cycle of switching the video signal input to said inverting means by said first selecting means is random in row units. . 6. The apparatus according to claim 1, further comprising a counter for counting the number of rows inverted by said inverting means, wherein the ratio of the inverted rows to the non-inverted rows is made equal.
The signal processing device according to any one of 2, 3, 4, and 5. 7. The signal processing apparatus according to claim 1, wherein a cycle of switching the video signal input to the inverting means by the first selecting means is set for each pixel. 8. The signal according to claim 1, wherein a cycle of switching the video signal input to said inverting means by said first selecting means is set to every two or more pixels. Processing equipment. 9. The signal processing apparatus according to claim 1, wherein a cycle of switching the video signal input to said inverting means by said first selecting means is random in pixel units. . 10. The apparatus according to claim 1, wherein a counter for counting the number of pixels inverted by said inverting means is provided, and the ratio of pixels to be inverted to non-inverted pixels is made equal. , 9.